Abstract
Monitoring of tickborne diseases is critical for prevention and management. We analyzed 418 ticks removed from 359 patients during 2014-2021 in Marseille, France, for identification and bacteria detection. Using morphology, molecular methods, or matrix-assisted laser desorption/ionization time-of-flight mass spectrometry, we identified 197 (47%) Ixodes, 136 (33%) Dermacentor, 67 (16%) Rhipicephalus, 8 (2%) Hyalomma, 6 (1%) Amblyomma, 2 (0.5%) Argas, and 2 (0.5%) Haemaphysalis tick species. We also detected bacterial DNA in 241 (58%) ticks. The most frequent bacterial pathogens were Rickettsia raoultii (17%) and R. slovaca (13%) in Dermacentor ticks, Borrelia spp. (9%) in Ixodes ticks, and R. massiliae (16%) in Rhipicephalus ticks. Among patients who were bitten, 107 had symptoms, and tickborne diseases were diagnosed in 26, including scalp eschar and neck lymphadenopathy after tick bite and Lyme borrelioses. Rapid tick and bacteria identification using a combination of methods can substantially contribute to clinical diagnosis, treatment, and surveillance of tickborne diseases.
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